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Auto-suture device for nasal surgery

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Presentation on theme: "Auto-suture device for nasal surgery"— Presentation transcript:

1 Auto-suture device for nasal surgery
Client: Dr. Benjamin Marcus Department of Otolaryngology Advisor: Professor Tyler Mark Yarmarkovich~Leader Joseph Cabelka~Communicator Jennifer Wager~BSAC Therese Rollmann~BWIG

2 Problem Statement Develop device to reduce suturing process in nasal surgery (septoplasty) Reduce OR costs ($60/min) The device should mimic the procedure currently used by the surgeon

3 Design Constraints Reduce suturing time (less than 10 minutes)
Autoclavable or one-time use Dimensions must conform to the nose Cost up to $300 for disposable, $1500 for multiple use

4 Background: Nose Septum: cartilage dividing nose into two chambers; 3-5 mm wide Cartilage Young’s Modulus=10MPa Mucous membrane lining each side of septum Nostril width: 10mm-15mm Flexible

5 Background: Septoplasty
Deviated septum Septum is severely shifted from midline Causes difficulty breathing, sleeping

6 Background: Septoplasty
Incision made to expose caudal end of septum Cartilage excised to prevent overriding Cartilage swung into alignment

7 Background: Suture Sutures Purse-string suture pattern Close incision
Strong, non-toxic polymer fiber Absorbable Purse-string suture pattern Continuous Circular Inverting

8 Current Device Autosuture devices currently available for bowel surgery Large scale Endostitch Automatic Needle Passer

9 Materials Autoclavable or one-time use Light weight and easy to handle
Durable if multiple use Titanium Composite Stainless Steel Grade 420 Medical Grade Plastic (PEEK) Density 4.42 g/cm3 7.75 g/cm3 1.32 g/cm3 Working Temperature 450°C 400°C 249°C

10 Design I: Mechanical Needle Passer
Needle passed with pulley system Locked into place by notched edges

11 Design I: Mechanical Needle Passer
Pros Mimics procedure Manipulated by surgeon Adjustable number of sutures Cons Many small parts Difficult to manufacture Difficult to autoclave Requires dexterity

12 Design II: Clamp Clamped on either side of the septum
Suture is manually inserted through raised septum

13 Design II Pros Cons Easy to manufacture Can be disposable Safe
Not adjustable to size of nose Not automatic

14 Design III: Magnetic Needle Passer
Magnetic field generated by coils secures needle Switch controls magnetic field activation

15 Design III: Magnetic Needle Passer
Pros Simple mechanism Easy to manipulate Mimics procedure Adjustable number of sutures Cons Magnetic field must generate sufficient force to hold the needle in place Size

16 Design Matrix Design I Design II Design III Total (50) 35 32 37
Suturing time (15) 11 8 13 Cost (5) 4 5 Manufacturability (5) 1 3 Safety (10) 7 9 6 Mimic procedure (10) Size (5) Total (50) 35 32 37

17 Future Work Discuss design options with client Build prototype
Test device for suture time and ease of use

18 References Autosuture. 29 January 2007<http://www.autosuture.com>. Azom. 6 March 2007<http://www.azom.com/details.asp?ArticleID=1141>. Cornell. 27 February 2007<http://www.mae.cornell.edu/PDF/mcv3/JB pdf>. Fact Sheet. 2 March 2007.<http://www.entnet.org/healthinfo/sinus/deviated-septum.cfm>. Kortenbach, Juergen Andrew . “Automatic needle-passer suturing instrument .” Patent no. 5,814, Lore, John. An Atlas of Head and Neck Surgery. 1988:Philadelphia. Modern Plastics. 6 March 2007<http://www.modernplastics.com/april05/wdtubing.html>. Septoplasty. 27 February 2007<http://emedicine.com/ent/topic128.htm>. Septum. 7 March 2007 <http://z.about.com/d/p/440/e/f/7166.jpg>.


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